Note: Please read the Important Instructions and Disclaimer file before solving the MCQs

10. CURRENT ELECTRICITY

1) A galvanometer with an unknown resistance in series is connected across two

identical cells each of 1.5V. When the batteries are connected in series, the galvanometer records a current of 1 A, and when the batteries are connected in parallel, the current is 0.6 A, the internal resistance of the battery is A) 0.33 B) 1 C) 0.66 D) 0.5

2) In the figure given below P and Q represents terminals of an unknown emf source. On moving jockey J from end A to B, the deflection in galvanometer remains in the same direction, but decreases. Which of the following conclusions is correct?

A) The emf E is less than the unknown emf B) The emf E is more than the unknown emf C) The total drop of potential across potentiometer wire is less than the

unknown emf D) The unknown emf is wrongly connected.

3) The wire of the potentiometer has resistance 4 ohms and length 1 m. It is

connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm. The current flowing in the potentiometer is: A) 0.1 A B) 0.2 A C) 0.4 A D) 0.8 A

4) The wire of the potentiometer has resistance 4 ohms and length 1 m. It is connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm. The p.d. across the potentiometer wire is: A) 2.0 V B) 1.6 V B) 1.2 V C) 0.8 V

5) The wire of the potentiometer has resistance 4 ohms and length 1 m. It is connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm, the potential gradient in the potentiometer wire is: A) 2.0 volt/m B) 1.6 volt/m C) 1.2 volt/m D) 0.8 volt/m

6) The wire of the potentiometer has resistance 4 ohms and length 1 m. It is connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm, if a cell of e.m.f. 1.2 volt is balanced by it, the balancing length will be A) 90 cm B) 60 cm C) 75 cm D) 50 cm

7) A potentiometer has a uniform wire of length 10m and resistance 5 . The potentiometer is connected to an external battery of emf of 10V and negligible internal resistance of 995 in series. The potential gradient along the were is: A) 1 mV/m B) 5 mV/m C) 1 mV/cm D) 5 mV/cm

8) A potentiometer wire, 10 m long, has resistance 40 ohms. It is put in series with a resistance 760 ohms and connected to a 2 volt battery. The potential gradient in the wire is : A) 1 10-6 volt/m B) 1 10-4 volt/m C) 1 10-3 volt/m D) 1 10-2 volt/m

9) In a Wheatstones bridge, P = 9 ohms, Q = 11 ohms, R = 4 ohms and S = 6 ohms. How much resistance must be put in parallel to the resistance S to balance the bridge? A) 24 ohms B) (44/9) ohms C) 26.4 ohms D) 18.7 ohms

10) In the measurement of resistance by a metre bridge, the current is necessarily reversed through the bridge wire to eliminate A) End errors B) Index errors C) Error due to thermoelectric effects D) Random errors

11) If 2% of the main current is to be passed through the galvanometer of resistance

G, the resistance of shunt required is A) G/49 B) 49G C) G/50 D) 50G

12) In the figure, when an ideal voltmeter is connected across 4000 ohm resistance, it reads 30 volts. If the voltmeter is connected across 3000 ohms resistance. It will read

A) 20 volt B) 22.5 volt C) 35 volt D) 40 volt

13) In the circuit shown in figure, the reading of ammeter A is A) 0.2 A B) 0.4 A C) 0.6 A D) 0.8 A

14) A cell supplies a current of 0.9 A through a 2 resistor and current of 0.3 A through a 7 resistor. What is the internal resistance of the cell?

A) 0.5 B) 1.0 C) 1.2 D) 2.0

15) A voltmeter having a resistance of 1800 is employed to measure the potential difference across a 200 resistor which is connected to the terminals of a DC power supply having an emf of 50 V and an internal resistance of 20 . What is the percentage decrease in the potential difference across the 200 resistor as a result of connecting the voltmeter across it? A) 1% B) 5% C) 10% D) 25%

16) The deflection in a moving coil galvanometer falls from 50 to 10 divisions when a shunt of 12 is connected across it. The resistance of the galvanometer coil is A) 24 B) 36 C) 48 D) 60

17) A galvanometer of resistance 10 gives full-scale deflection when 1 mA current passes through it. The resistance required to convert it into a voltmeter reading upto 2.5 V is A) 24.9 B) 249 C) 2490 D) 24900

18) The driver cell of a potentiometer has an emf of 2 V and negligible internal resistance. The potentiometer wire has a resistance of 5 and is 1 m long. The resistance which must be connected in series with the wire so as to have a potential difference of 5mV across the whole wire is A) 1985 B) 1990 C) 1995 D) 2000

19) Two identical cells of emf 1.5 V each connected in parallel provide a supply to an external circuit consisting of two resistors of 7 each joined in parallel. A very high resistance voltmeter reads the terminal voltage of the cells to be 1.4 V. What is the internal resistance of each cell? A) 0.2 B) 0.3 C) 0.4 D) 0.5

20) What is the steady current in the 2 resistor shown in the figure? The internal resistance of the battery is negligible and the capacitance C= 0.5 F.

A) 0.3 A B) 0.6 A C) 0.9 A D) 1.2 A

21) In the potentiometer circuit shown in the figure, the balance point with R = 10 when switch S1 is closed and S2 is open is 50 cm, while that when S2 is closed and S1 is open is 60 cm. What is the value of X?

A) 1 B) 2 C) 3 D) 4

22) In the potentiometer circuit shown in the figure, the balance length AJ = 60 cm when switch S is open. When switch S is closed and the value of R = 5 , the balance length AJ = 50 cm. What is the internal resistance of cell C?

A) 0.6 B) 0.8 C) 1.0 D) 1.2

23) A voltmeter reads 3 V at full-scale deflection and is graded as 6000 /V. What

resistance should be connected in series with it so that it reads 12 V at full-scale deflection? A) 1.8 104 B) 3.6 104 C) 5.4 104 D) 7.2 104

24) In figure, the galvanometer shows no deflection. What is the resistance X?

A) 7 B) 14 C) 21 D) 28

25) The range of a voltmeter is 5V and its resistance is 5000 (4900 connected in series with a coil of resistance 100 ). What additional resistance should be connected in series with it so that its range is doubled? A) 5000 B) 4500 C) 4000 D) 3500

26) Figure shows a network of resistances connected to a 2V battery. If the internal resistance of the battery is negligible, current I in the circuit is

A) 0.25 A B) 0.5 A C) 0.75 A D) 1.0 A

27) A battery of emf 10V is connected to resistances as shown in the figure. The potential difference between points A and B is

A) -2 V B) 2 V C) 5 V D) 20/11 V

28) An ideal battery of emf 2 V and a series resistance R are connected in the primary circuit of a potentiometer of length 1 m and resistance 5 . The value of R, to give a potential difference of 5 mV across 10 cm of potentiometer wire is A) 180 B) 190 C) 195 D) 200

29) The range of a voltmeter of resistance 300 is 5 V. The resistance to be connected to convert it into an ammeter of range 5 A is A) 1 in series B) 1 in parallel C) 0.1 in series D) 0.1 in parallel

30) The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of 10 is connected in parallel to the cell, the balancing length changes by 60 cm. The internal resistance of the cell in ohms, is; A) 1.6 B) 1.4 C) 1.2 D) 0.12

31) In a metre bridge experiment null point is obtained 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y? A) 50 cm B) 80 cm C) 40 cm D) 70 cm

32) What is the total current supplied by the battery to the circuit shown in the adjoining figure?

A) 1 A B) 2 A C) 4 A D) 6 A

33) The potential difference between points A and B in the given circuit is

A) 32 V

B) 98 V

C) 34 V

D) 2V

34) What is the reading of the ammeter in the given circuit, when the key is closed?

A) 0.25 A B) 0.5 A C) 1.0 A D) 2.0 A

35) In the given circuit, the reading of voltmeter is

A) 20 V B) 0.8 V C) 1.33 V D) 1.66 V

36) In the given circuit, current through 2 resistor is

A) 1 A B) 1.9 A C) 0.9 A D) 1.6 A

37) In the given circuit, if galvanometer reads zero, the value of resistance R is

A) 8 B) 16 C) 24 D) 32

38) In a circuit as shown, a battery of emf 10 V and negligible resistance is connected across two resistances of 500 ohms each in series. A voltmeter of 1000 ohms resistance is connected across one resistance. What is reading of the voltmeter?

A) 4 Volt B) 2 Volt C) 3 Volt D) 1 Volt

39) In the given figure, ammeter reads 5A, and voltmeter reads 40 V, the actual value of R is

A) 8 B) >8 C) > R) is

A) 8 B) >8 C)

41) The reading of ammeter is

A) A51100220

B) A31100220

C) A11100220

D) A21100220

42) In the circuit, current supplied by battery is

A) 1A B) 2 A C) 4 A D) 4.5 A

43) The resistivity of potentiometer wire is 4 10-8 ohm-m and its area of across-section is 8 10-6 m2. If 0.2 A current is flowing through the wire, the potential gradient will be A) 10-2 Vm-1 B) 10-1 Vm-1 C) 3.2 10-2 V/m D) 1 Vm-1

44) Three voltmeters, all having different resistances, are joined as shown. When some P.D. is applied across A and B, then readings are V1, V2, V3

A) V1 = V2 B) V1 < V2 C) V1 + V2 = V3 D) V1 + V2 > V3

45) If S is closed in the following circuit, then

A) reading in A1 increases and A2 decreases B) reading in A1 increases and A2 also increases C) reading in A1 unaffected and A2 decreases D) reading in A1 increases and A2 unaffected.

46) In the circuit shown, the internal resistances are r1 and r2. The external resistance

is 8 ohm. If the voltmeter put across the first cell, gives no deflection, then

A) 8 = r 1 + r 2

B) 8 = 21

21

rrrr

C) 8 = r 1 - r 2 D) 8 = r 2 - r 1

47) In the circuit shown, a voltmeter reads 30 V when connected across 400

resistor. The reading of the voltmeter when connected across 300 will be

A) 15.5 V B) 16.5 V C) 20.5 V D) 22.5 V

48) A potentiometer wire has a resistance of 5 and is connected to a cell of steady e.m.f. 2 V and internal resistance 0.5 . The potentiometer can measure a maximum voltage of A) 2.5 V B) 1.5 V C) 1.8 V D) 2.1 V

49) In the circuit diagram shown in the figure, the magnitude and direction of the flow of current respectively would be

A)

37 A from a to b via e

B) 37 A from b to a via e

C) 1 A from b to a via e D) 1 A from a to b via e

50) An ammeter of resistance 0.16 ohm is shunted with a resistance of 0.04 ohm and gives a reading of 8 A. The current in the main circuit is A) 40 A B) 20 A C) 16 A D) 24 A

51) A voltmeter of 100 V range is of 9000 ohm resistance and another voltmeter of range 80 V has a resistance of 11000 ohms. This combination is connected across 120 V. The reading of voltmeter of 100 V range will be A) 54 V B) 44 V C) 66 V D) 56 V

52) The length of a wire of a potentiometer is 100 cm and emf of its standard cell is E volt. It is used to measure the emf of a battery whose internal resistance is 0.5 . If the balance point is obtained at l = 30 cm from the positive end, the emf of battery is

A) )5.0100(

30E

B) 100

)5.0(30 iE

C) 10030E

D) 5.100

30E

53) Kirchhoffs first law, i.e. I = 0 at a junction, deals with the conservation of

A) charge B) energy C) momentum D) angular momentum

54) Figure shows current in a part of an electrical circuit. Then current I is

A) 1.7 A B) 3.7 A C) 1.3 A D) 1 A

55) The algebraic sum of the currents at the point O in the following circuit is

A) 0 A B) 0.75 A C) 0.375 A D) 1.5 A

56) Two cells of 1.25 V and 0.75 V are connected in parallel. The effective voltage will be A) 0.75 V B) 1.25 V C) 2.0 V D) 0.50 V

57) In the arrangement of resistances shown in the circuit, the potential difference between point B and D will be zero, when the unknown resistance X is

A) 4 B) 3 C) 2 D) 1

58) A current of 2 A flows in conductors as shown. The potential difference VA- VB will be

A) + 2 V B) + 1 V C) 1 V D) + 4 V

59) The instrument for the accurate measurement of the e.m.f of a cell is A) a voltmeter B) an ammeter C) a potentiometer D) a slide wire bridge

60) Potentiometer measures the potential difference more accurately than a voltmeter, because A) it has a wire of high resistance B) it has a wire of low resistance. C) It does not draw current from external circuit. D) It draws a heavy current from external circuit.

61) In a potentiometer experiment, for measuring internal resistance of a cell, the

balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by A) decreasing the current due to auxiliary battery B) increasing the current due to auxiliary battery C) putting a suitable resistance in series with the cell. D) Putting a shunt resistance in parallel with the cell.

62) It is observed in a potentiometer experiment that no current passes through the

galvanometer, when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 resistance, the balancing length is reduced to half. The internal resistance of the cell is A) 4 B) 2 C) 9 D) 18

63) The sensitivity of the potentiometer can be increased by: A) increasing the e.m.f. of primary cell. B) increasing the potential gradient. C) increasing the length of potentiometer wire. D) decreasing the length of potentiometer wire.

64) In the circuit shown in the figure, P R. The reading of the galvanometer is

same with switch S open or closed. Then,

A) IR = IG B) IP = IG C) IQ = IG D) IQ = IR

65) When the four resistors are connected as shown, it is found that the current

flowing through the galvanometer G is zero. The resistance R is

A) 3 ohm B) 4.5 ohm C) 18 ohm D) impossible to determine without knowing the e.m.f. of the battery.

66) In a typical Wheatstones network, the resistances in order are P = 10 , Q = 5 , S = 4 , R = 4 . In order for the bridge to balance, A) 10 should be connected in series with P B) 10 should be connected in parallel with P C) 5 should be connected in series with Q D) 5 should be connected in parallel with Q

67) In a meter bridge, the balancing length from the left(standard resistance of 1 is in the right gap) is found to be 20 cm. The value of the unknown resistance is A) 0.8 B) 0.5 C) 1.4 D) 0.25

68) Two resistances are connected in the two gaps of a meter bridge. The balance points is 20 cm from the zero end. When a resistance of 15 ohm is connected in series with the smaller of the two resistances, the null point shifts to 40 cm. The smaller of the two resistances has the value(in ohm) A) 8 B) 9 C) 10 D) 12

69) An unknown resistance R1 is connected in series with a resistance of 10 ohm. This combination is connected to one gap of a meter bridge, while other gap is connected to another resistance R2. The balance point is at 50 cm. Now, when the 10 ohm resistance is removed, the balance point shifts to 40 cm. Then, the value of R1 (in ohm) is A) 60 B) 40 C) 20 D) 10

70) In the circuit shown in the figure, the current through the

A) 3 resistor is 0.50 A B) 3 resistor is 0.25 A C) 4 resistor is 0.50 A D) 4 resistor is 0.25 A

71) In the figure, the potentiometer wire AB has a resistance of 5 and length 10 m. The balancing length AJ for the e.m.f. of 0.4 V is

A) 4 m B) 1.5 m C) 0.8 m D) 0.4 m

72) When the balance point is obtained in a potentiometer experiment for finding the internal resistance of a cell; the current through the potentiometer wire is due to A) the cell, whose internal resistance is to be found B) the auxiliary battery C) both cell and the auxiliary battery D) neither the cell nor the battery.

73) The length of wire of a potentiometer is 100 cm and the e.m.f. of its standard cell

is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5 . If the balance point is obtained. at l = 30 cm from the positive end, the e.m.f. of the battery is

A) )5.0100(

30E

B) .100

)5.0(30 iE Where i is the current in the potentiometer wire

C) 10030E

D) 5.100

30E

74) Express which of the following setups can be used to verify Ohms law?

75) A 4 V cell in the circuit shown below has zero internal resistance. An accurately

calibrated voltmeter connected across YZ records 1.5 V. What is the resistance of the voltmeter.

A) 120 B) 240 C) 360 D) 80

76) A potentiometer is connected between A and B and the balance point is obtained

at 203.6 cm. When the end of the potentiometer connected to B is connected to C, then the balance point is obtained at 24.6 cm. If now the potentiometer is connected between B and C, then where will the balance point be obtained? A) 228.2 cm B) 179.0 cm C) 118.1 cm D) 6.246.203 cm

77) In the diagram given below the potentiometer wire AB is 100 cm, and the

potential difference cross the points P and Q is balanced on 60 cm length of the potentiometer wire. To balance the potential difference across the points Q and S, at what distance from A the jockey J should be pressed on the wire?

A) 25 cm B) 45 cm C) 60 cm D) 75 cm

78) The ammeter reading in the circuit given below will be

A) 2.6 A B) 5.2 A C) 6.5 A D) 7.2 A

79) A potentiometer wire of length 1 m and resistance 10 ohm is connected in series

with a cell of emf 4 V and internal resistance 1 and a resistance box including a resistance R. If the P.D between the ends of the wire is 1 mV, the value of R in ohms is A) 299989 B) 39989 C) 20000 D) 10000

80) The voltmeter connected in the circuit shows a reading of 10 V. Resistance of the voltmeter in ohms is

A) 200 B) 10 C) 50 D) 100

81) In a meter bridge, the balance is found at 40 cm point when a 10 ohm resistor is

connected in the first arm of the bridge. Then the resistance in the second arm should be A) 15 ohm B) 40 ohm C) 30 ohm D) 10 ohm

82) The current in the following circuit is

A) 31 A

B) 21 A

C) 32 A

D) 23 A

83) Two resistances are connected in the two gaps of a meter bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two resistances when the null point shifts to 40 cm. The smaller of the two resistances has the value A) 8 ohms B) 9 ohms C) 10 ohms D) 12 ohms

84) An unknown resistance R1 is connected in series with a resistance of 10 . This

combination is connected to one gap of the meter bridge while a resistance R2 is connected in the other gap. The balance point is at 50cm. Now when the 10 resistance is removed the balance point shifts to 40cm. The value of R1 is (in ohms) A) 20 B) 10 C) 60 D) 40

85) Kirchhoffs second law is a consequence of

A) Law of conservation of momentum B) Law of conservation of energy C) Law of conservation of charge D) Law of conservation of angular momentum

86) In the circuit given below, which of the following relations is true

A) I1R1-I2R2+I3R3=E1-E2

B) I1R1+I2R2-I3R3=0

C) I1R1+I2R2+I3R3=E2-E1

D) I1R1-I2R2+I3R3=E1

87) The figure below represents a part of a closed circuit. The potential difference between points A & B, (VA-VB) is

A) 11V B) +9V C) -11V D) +6V

88) In the circuit given, when key K1 is closed, the ammeter reads Io whether K2 is

closed or open. But when K1 is open, ammeter reads 20I when K2 is closed. Then

the values of r & R1 are

A) 0,50 B) 50,100 C) 100,50 D) 0,100

89) In a Wheatstones network, the ratio arms P and Q are nearly equal. When R=49 , the bridge is balanced. If we interchange P and Q, value of R required for balance is 36 . Then the value of unknown resistance S is given by A) 50 B) 30 C) 32 D) 42

90) When two cells of emfs 1.8 V & 1.2 V are connected in conjuction, balancing

length on a potentiometer wire is 540 cm. The balancing length when they are connected in opposition is A) 140cm B) 200cm C) 108cm D) 220cm

91) The resistance of 10 m potentiometer wire is 20 . A resistance box is connected in series with a cell of emf 2 V & internal resistance 1 to the ends of this potentiometer wire. The value of resistance to be unplugged in resistance box so that there is fall of potential of 0.01 mV/cm is A) 1979 B) 2979 C) 4000 D) 3979

92) In a meter bridge, when galvanometer & cell positions are interchanged

A) Exactly same relation between four resistance is got B) Inverse relation between four resistance is got C) No relation is got between four resistances D) Cant predict the relation

93) Four resistances 15,12,4, & 10 are connected in cyclic order to form a

Wheatstone network. The resistance to be connected in parallel with 10 to balance the network is A) 5 B) 10 C) 8 D) 20

94) An ammeter together with an unknown resistance in series is connected across

two identical batteries each of emf 1.5 V. When the batteries are connected in series, the galvanometer records a current of 1A and when the batteries are in parallel, the current is 0.6A. Then the internal resistance of the battery is

A) 31

B) 21

C) 41

D) 51

95) A battery is connected with a potentiometer wire. The internal resistance of the

battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then A) Potential gradient does not change B) Potential gradient becomes half C) Potential gradient becomes two times D) None of these

96) A potential difference of 220 V is maintained across 12000 rheostat. Then voltmeter V has a resistance of 6000 and point C is at one fourth the distance from a to b. Then the reading of voltmeter is

A) 30 volt B) 40 volt C) 45 volt D) 60 volt

97) Figure shows current in a part of an electrical circuit. Then current I is

A) 1.5 A B) 2.5A C) 0.5A D) 2.1A

98) Find the pd between A and B from the figure

A) 2 V B) 4 V C) 6V D) 8V

99) The figure shows an unbalanced Wheatstone bridge. To balance the bridge:

A) 15 ohm resistance should be reduced to 10 ohm B) 95 ohm resistance should be reduced to 90 ohm C) 8 ohm resistance should be increased to 10 ohm D) 48 ohm resistance should be increased to 50 ohm

100) A current is passed though two coils connected in series. The potential difference

across the first coil of resistance 2 ohm is 5 volt. If the potential difference across the second coil is 12.5 volt the resistance of the second coil is A) 5 ohm B) 6 ohm C) 7 ohm D) 12.5 ohm

101) In a meter bridge experiment a balance point is obtained at a distance of 60 cm

from the left end when unknown resistance R is in a left gap and 8 ohms resistor is connected in the right gap. When the position of R and 8 ohm resistor is interchanged the balance point will be at distance of A) 60 cm B) 40 cm C) 50 cm D) 80 cm

102) The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell

of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance again A) Resistance R4 should be changed only B) Both the resistance R1 and R4 should be changed C) All the four resistance should be changed D) No resistance needs to be changed

103) A Wheatstone bridge is balanced for four resistors R1 R2R3 and R4 with a

Lechlanche cell between A and C and a galvanometer between B and D. The positions of the cell and the galvanometer are interchanged. The balance will A) Change and can be obtained by changing R1 B) Change and can be obtained by changing R4 C) Change and can be obtained by changing R1 and R4 D) Not change

104) A Wheatstone bridge ABCD is balanced with a galvanometer between the points B and D. At balance the resistance between the points B and D is : A) Zero B) Infinite C) Between zero and infinite D) None of the above

105) The ratio of the currents I1 when switch S is off and I2 when switch S is on is

A) 1:1 B) 2:1 C) 1:2 D) Zero:2

106) The Wheatstone bridge shown in the figure is balanced. If the positions of the cell

C and the galvanometer G are now interchanged, G will show zero deflection

A) in all cases B) only if all the resistances are equal C) only if R1 = R3 and R2 = R4 D) only if R1/R3 = R2/R4

107) In the circuit shown below, the galvanometer G will show zero deflection

A) in all cases B) only if S is open C) only if S is closed D) none of the above.

108) A milliammeter of range 10 mA has a coil of resistance 1 .To use it as an

ammeter of range 1 A, the required shunt must have a resistance of

A) 101

1

B) 100

1

C) 991

D) 91

109) To use the milliammeter of the previous question as a voltmeter of range 10 V, a

resistance R is placed in series with it. The value of R is A) 9 B) 99 C) 999 D) 9999

110) A milliammeter of range 10 mA gives full-scale deflection for a current of 100 mA, when a shunt of 0.1 is connected in parallel with it. The coil of the milliameter has a resistance of A) 0.9 B) 1 C) 1.1 D) 0.11

111) In a moving-coil instrument, the coil is suspended in a radial magnetic field

instead of a uniform magnetic field. This is done to A) increase the sensitivity of the instrument B) increase the accuracy of the instrument C) make the instrument compact and portable D) make its deflection proportional to the current through it

112) In the circuit shown, the cell has emf = 10 V and internal resistance = 1 .

A) The current through the 3- resistor is 1 A. B) The current through the 3- resistor is 0.5 A. C) The current through the 4- resistor is 0.5 A. D) The current through the 4- resistor is 0.25 A.

113) In the circuit shown below, the cell is ideal, with emf = 2 V. The resistance of the

coil of the galvanometer G is 1 .

A) No current flows in G. B) b. 0.2 A current flows in G. C) Potential difference across C1 is 1 V. D) Potential difference cross C2 is 1.2 V.

114) Three voltmeters, all having different resistances, are joined as shown. When

some potential difference is applied across A and B, their readings are V1, V2 , V3 .

A) V1 = V2 B) V1 V2 C) V1 + V2 = V3 D) V1 + V2 > V3

. 115) A microammeter has a resistance of 100 and a full- scale range of 50 A. It

can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination (s). A) Range 50 V, with a 10 k resistance in series B) Range 10 V, with a (2 105 100) resistance in series C) Range 5 mA, with a 1.01 resistance in parallel D) Range 10 mA, with a 1 resistance in parallel

116) A milliammeter of range 10 mA and resistance 9 is joined in a circuit as shown. The device gives full-scale deflection for current I when A and B are used as its terminals, i.e., current enters at A and leaves at B (C is left isolated). The value of I is

A) 100 mA B) 900 mA C) 1 A D) 1.1 A

117) The figure shows a potentiometer arrangement. D is the driving cell. C is the cell

whose emf is to be determined. AB is the potentiometer wire and G is a galvanometer. J is a sliding contact which can touch any point on AB. Which of the following are esstential conditions for obtaining balance?

A) The emf of D must be greater than the emf of C. B) Either the positive terminals of both D and C or the negative terminals of

both D and C must be joined to A C) The positive terminals of D and C must be joined to A. D) The resistance of G must be less than the resistance of AB.

10. CURRENT ELECTRICITY

Ques. No. Answer 1 A 2 C 3 C 4 B 5 B 6 C 7 B 8 D 9 C

10 A 11 A 12 B 13 B 14 A 15 A 16 C 17 C 18 C 19 D 20 C 21 B 22 C 23 C 24 D 25 A 26 B 27 C 28 C 29 B 30 C 31 A 32 C 33 C 34 D 35 C 36 C 37 C 38 A 39 B 40 C

Ques. No. Answer 41 B 42 C 43 A 44 C 45 D 46 C 47 D 48 C 49 D 50 A 51 A 52 C 53 A 54 A 55 A 56 D 57 C 58 B 59 C 60 C 61 A 62 B 63 C 64 A 65 C 66 B 67 D 68 B 69 C 70 D 71 B 72 B 73 C 74 A 75 C 76 B 77 B 78 C 79 D 80 C

Ques. No. Answer 81 A 82 C 83 B 84 A 85 B 86 A 87 A 88 A 89 D 90 C 91 D 92 A 93 B 94 A 95 A 96 B 97 B 98 B 99 B

100 A 101 B 102 D 103 D 104 B 105 C 106 A 107 B 108 C 109 C 110 A 111 D 112 A 113 A 114 B 115 B 116 C 117 A